Sr_1-x(La, AM)_x-M型フェライトの合成と磁気的性質(AM=Na, K)

抄録

The appeared phases and magnetic properties of Sr_1-x(La, AM)_x ferrites (AM=Na, K) were studied. The prepared samples having the nominal composition of (Sr_1-x⋅(La, AM)_x)O⋅6Fe₂O₃, contain α-Fe₂O₃ phase and M-type ferrite phase. However the single phase of M-type ferrites with nominal compositions of (Sr_1-x(La_0.5Na_0.5)_x)O⋅(6-2x)Fe₂O₃ and (Sr_1-x(La_0.7K_0.3)_x)O⋅6-x)Fe₂O₃, where x=0.2 -0.8, was obtained by the selection of a tie-line composition. The c-axis of M-type ferrites became shoter with increasing x. Their magnetizations, Curie temperatures and anisotropy fields decreased with increasing the amount of substitution of La-AM for Sr.